/* 1vh 就是 视口高度的 1% */
.color-container{
  height: 100vh;
  display:flex;
  justify-content: center;
  align-items: center;
}

.picker{
  width: 400px;
  min-height: 400px; 
}
.show{
  width: 400px;
  height: 300px;
  background: #aef;
}